Symmetricom 5071A, Сборка и сервисное обслуживание

Страница: 186 / 202

4. Replacing Assemblies - Disassembly and Reassembly
To Remove A17 CBT Assembly
170
14 Affix snugly, but DO NOT TIGHTEN the brackets to hold the CBT in
place, allowing for rotation of the CBT.
15 Rotate the CBT so that the SMA nut and rigid coax are aligned as straight
as possible with the connector on the Microwave Adapter.
16 Using your fingers only, begin screwing the SMA nut onto the Microwave
Adapter. If aligned properly, the SMA nut should rotate easily until it is
“finger tight”. It may be necessary to rotate the CBT slightly while
tightening the SMA nut.
17 Finish tightening the four T25 TORX® screws to hold the CBT firmly in
position.
18 Now, finish tightening the SMA nut to a final torque of 8.5 inch-pounds,
using the 1/4” wrench to hold the semi-rigid coax in position while
tightening the SMA nut.
NOTE
Following the above procedure ensures that there will be no RF
leakage at the SMA connection after final torque has been applied.
19 If a settable wrench is not available, use both a standard 5/16” and a 1/4”
open end wrench and do your best to assure a tight connection. A good
rule of thumb is to make the connection as tight as it was when initially
removed.
20 Connect the two multiple-pin connectors to the A2 CBT Controller
assembly, being sure to lock them into place.
21 Refer to your notes to correctly and carefully re-connect the High Voltage
leads snugly to the CBT. DO NOT OVER TIGHTEN. Use only your
fingers to prevent breaking the plastic or ceramic threads.
22 Turn the unit on its side to allow connecting the right-angle SMB
connector to the A14 Signal Amplifier module.
23 Attach a new wire tie to bind the black signal coax to the same bundle as
before. Trim excess tie wrap.
24 Before replacing the top and bottom covers, be sure that there are no
cables or wires that will be pinched in the process.
25 Replace the top and bottom covers and the rear feet.